Sue rowerd her boat across Lake Bend and back in 3 hours. If her rate rowing back was 2 mph less than her rate rowing across, and if the distance each way was 7 miles, find her rate rowing across.

(7/x)+(7/x-2)=3

Multiply by x(x-2) on both sides

7(x-2)+7x=3x(x-2)

14x-14=3x2-6x

3x2-20x+14=0

X=5.87 mph the rate rowing across

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